zinc plating thickness

The normal zinc-plated coating is dull gray in color with a matte finish. Q. Thickness to reach 1 oz/ft 2. ASTM B633 [affil.

"popup": { "button": { To shed more light on our zinc plating thickness issue, most of our in-house thread ring gages are class 2A gages. I am familiar with plating but not with IEEE [link is to specs at TechStreet] or NEMA [link is to specs at TechStreet] or other standards that might dictate plating thickness for this particular application. It is unusual to specify less than .0002" average plating thickness, so .0002"-.0005" doesn't sound at all unreasonable to me. Industry (with limited exposure to corrosive substances), marine environments (not immersed, not splashed), outdoors. A. Hi Gary. If the finish is at a minimum .0002" is there a binding risk because the plating doesn't specify a max tolerance? All of these increase the original diameter.

All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer.

Applicable Industry Spec: ASTM B633, SC1, Type III, Applicable Industry Spec: ASTM B633, SC1, Type II, Applicable Industry Spec: ASTM B633, SC1, Type III plus a lubricated topcoat, ZB Applicable Industry Spec: ASTM B633, SC1 (5µm), Type III, Black All rights reserved. Also, in special applications the thickness on the threads is considered that it affects 4 parts of the thread; the right hand side of the thread (crest), the left side of the same thread and the same happens on the other side of the fastener.

A. Hi Manikandaprabu. 42 mm & length 200 mm.

letter 2906 and Threaded holes should be tapped oversize to allow for the coating buildup, or masked to prevent coating. See our, Offices, domestic premises (excluding kitchens and bathrooms). Our preplate gages have been setup to allow for .0001-.00035" plate thickness. Q. Dear all, Ed. 2003 but continuing through 2019. What is a reasonable thickness and tolerance to require for electrodeposited zinc on parts with external threads? new LazyLoad(); For some applications, designers may opt to use zinc-nickel plating instead of zinc plating for further corrosion resistance, the above table will not be applicable. We do not recommend powder coating. 25 µm for very severe service ©1995-2020 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy

Q. link to spec at Techstreet] correctly we should be allowed to go to class 3A gages to allow for the thread growth on external threads. Is my math correct or can I get by with Fe/Zn 8ANS per F1941? 5 µm for mild service Zinc Plating is commonly used in a variety of industries, including industrial and defense.

Please email us if you would like advice on zinc plating thickness. Q. },

The corrosion resistance of the zinc depends on two things: The protection from the zinc plating is proportional to the thickness of the zinc plating - so thicker zinc means more protection for the base metal. Actually the thickness of the zinc plating can be irrelevant because, although the zinc plating prevents red rust, it is the chromate conversion coating and any subsequent top coats that prevents the … How can I specify the plating; what is the standard I have to refer to? "background": "#237afc"

13 µm for severe service The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful. If the allowance of an #6-32 UNC-2B screw is .0008" and I use Fe/Zn 5ANS per ASTM F1941 I should be fine because 5 microns is t=.0002" and multiplied by 4 then the pitch diameter of the screw is increased by .0008". In the past we have attempted to produce threads to a undersize pitch diameter (less 4 times plating thickness) and use the 2A gages to check afterplate condition. } https://metalfinishingsltd.co.uk/articles/zinc-thickness-guidance Plating Thickness – The zinc plating shall be a minimum thickness of.0002 inch (5 µm) on all significant surfaces.

zinc thickness — this protects the base material from corrosion (often referred to as protection to “red rust”), passivation — this protects the zinc from corrosion (often referred to as protection to “white rust”). Consult'g, Train'g, SoftwareEnvironmental Compliance. It is suggested that you have the part zinc plated and then paint any exposed areas. & Install'nChemicals & Consumables

A. Hi, Syed. PennEngineering uses the detection methods defined in the IEC-62321-7-1:2015 to measure hexavalent chrome in the chromate conversion (passivation) layer of our zinc-chromate plated parts to assure they are not hexavalent chromium based as determined by IEC-62321-7-1:2015 and other consensus standards.

Please tell us what thickness you require on your purchase order. I have several concerns with doing this: the cost of new pre-plate gaging, the effect of .0005" plating thickness on the 60 deg. If there are no such standards, and this application is indoors in a relatively benign environment, then 5 µm (0.0002") minimum would be a good place to start because that's pretty much the commercial minimum. I hope this helps Enrique. Now, what are you using as a nut? Our preplate gages have been setup to allow for .0001-.00035" plate thickness. If you need a product/service, please check these Directories: JobshopsCapital Equip. We have experienced substantial fallout on external threaded parts requiring zinc plating that do not pass after-plate thread ring gages. is one of the better known standards which defines required thickness vs. service conditions: }); })}); 60,000 Q&A topics -- Education, Aloha, & Fun, manufacturing engineer - Riyadh, Centeral, Saudi Arabia, -- this entry appended to this thread by editor in lieu of spawning a duplicative thread, ©1995-2020 finishing.com, Inc., Pine Beach, NJ, How Google uses data when you visit this site. SIR, MY QUESTION IS WHAT IS THE THICKNESS OF ZINC ALKALINE ON THREAD BOLT? The coating thickness can be controlled within .0005”. The thickness of zinc plating that you should use depends on the environment that the component is in. Concentrations of lead, mercury, poly-brominated Biphenyls (PBB) and polybrominated diphenyl ethers (PBDE), in any as deposited homogenous material must be less than 1000 PPM or 0.1%.

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Is the class 3A gaging option more forgiving for a thicker plating allowance (.0002-.0005")? elements_selector: "iframe" That doesn't strike me as unreasonable as long as there are no industry standards which you have agreed to meet which call for the thicker plating. While coating densities for some types of zinc coatings are nearly identical, others differ considerably. Plating thickness is crucial for functional coatings since the thickness of the coating is proportional to its durability. thread form, extensive print changes, and conflict with our existing customer prints. affil. A.

We have experienced substantial fallout on external threaded parts requiring zinc plating that do not pass after-plate thread ring gages. A discussion started in "text": "#237afc" of .152 mm. The concentration of cadmium must be less than 100 PPM or 0.01%.

Good luck. I need to zinc plate (and gold passivate) a screw of dia.

We suggest that you specify using the ISO 2081 system (as in table above). link to spec at Techstreet] "background": "#fff", Q. Hi, Good day, I am Manikandaprabu, We are using Boron steel with zinc plating and olive darb passivation for SELF TAPPING SCREW ST 4.2x13-C that is used in drain hose assembly of washing machine. Alkaline zinc — This offers less plating efficiency than acid zinc and a slower electrodeposition rate, but it provides better thickness distribution and ductility Choosing the appropriate zinc plating procedure — After solution preparation, the parts are ready for plating. window.cookieconsent.initialise({ Surfaces on which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, are …

Thickness has almost no effect on the resistance to “white rust” because this involves the coating itself corroding. © Metal Finishings Ltd 2010 - 2019. What should be minimum coating thickness for zinc plating on mounting pan of electrical load centers? This page just gives general suggestions and our specialists will be able to provide more in-depth information. The answer will depend in large part on what average or minimum plating thickness you are specifying. or. What is a safe plating that should not cause binding in the threads for a #6 screw? Zinc Plating

In the most corrosive environments, particularly those with a risk of salt spray, zinc plating alone will probably be insufficient. "palette": { The coating is entirely pure zinc, which has a hardness about one-third to one-half that of most steels. 8 µm for moderate service note: The following threads also seem to offer good insight into thread allowances for plated parts: Rather, a thickness is specified based on the service conditions. Q.

How Google uses data when you visit this site. } A. Gary & Ted, This might sound as a very stupid comment, but we have encountered this problems in the past and some clients don't consider that the thickness of the deposit has to be counted double when considering a round diameter. Light industry (excluding exposure to corrosive substances), in domestic garden areas covered by roofs.

For example, to improve corrosion resistance, zinc coatings are commonly employed over steel. by Herb Geduld This page is provided for information only, it should not be considered advice and we cannot accept any responsibility or liability for your use of the information on this page. The thread gauge should be your guide, make sure the incoming material has tolerance for plating thickness and the outgoing part also meets the post plating thread gauge. Have you considered the thickness on this part also?


currently our plating thickness is Fe/Zn 12.5 microns and for cost effectiveness shall I reduce it to Fe/Zn 8. ---- Q. Thickness in each side of the part. from Abe Books We have produced some recommendations based on what we find is suitable for most of our customers. A. Hi manoj. The information on this page is used and relied on at your own risk and you bear the sole responsibility for any outcomes.

The coating densities, in terms of thickness required to equal 1 oz of zinc per square foot of surface, are: Coating. The customer has mentioned reduction in effective dia. Zinc coating is usually thin, ranging up to 1 mil (25 µm).

Our current plating supplier is asking for us to loosen the tolerance to .0002"-.0005" stating that this is as good as the industry can provide. BZ Applicable Industry Spec: ASTM B633, SC1 (5µm), Type III, Blue, Classification Numbers (ECCN, CAGE, DUNS, NAICS), CAMDS (China Automotive Material Data System), DFARS (Defense Federal Acquisition Supplement), IMDS (International Material Data System), ITAR (International Traffic In Arms Regulations), ODS General Statement (Ozone Depleting Substances), UL (Underwriter Laboratories Safety and Certification Organization – PEM Product Certifications), 3D Models (download or direct insert free on website), Employee Spotlight – Larry Zhang, New Product Applications Manager, Kunshan, China, DesignFax October 2019 – Trends in Fastening Technology: Smaller, Lighter, Easier to Install.


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